 apt install curl wget apt-transport-https dirmngr 
 
 wget http://www.deb-multimedia.org/pool/main/d/deb-multimedia-keyring/deb-multimedia-keyring_2016.8.1_all.deb && dpkg -i deb-multimedia-keyring_2016.8.1_all.deb
curl https://repo.dovecot.org/DOVECOT-REPO-GPG | gpg --import && gpg --export ED409DA1 > /etc/apt/trusted.gpg.d/dovecot.gpg
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xF1656F24C74CD1D8
wget https://nginx.org/keys/nginx_signing.key && apt-key add nginx_signing.key
curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
wget -q -O- https://packages.sury.org/php/apt.gpg | apt-key add -
wget http://www.webmin.com/jcameron-key.asc && apt-key add jcameron-key.asc  && rm jcameron-key.asc
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
-
deb http://cdn-fastly.deb.debian.org/debian/ buster main contrib non-free
deb-src http://cdn-fastly.deb.debian.org/debian/ buster main contrib non-free

deb http://cdn-fastly.deb.debian.org/debian/ buster-updates main contrib non-free
deb-src http://cdn-fastly.deb.debian.org/debian/ buster-updates main contrib non-free

deb http://security.debian.org/ buster/updates main contrib non-free
deb-src http://security.debian.org/ buster/updates main contrib non-free

#------------------------------------------------------------------------------#
#                      UNOFFICIAL  REPOS                       
#------------------------------------------------------------------------------#

###### 3rd Party Binary Repos
###Debian Multimedia
deb [arch=amd64,i386] https://www.deb-multimedia.org buster main non-free

###Dovecot
deb https://repo.dovecot.org/ce-2.3-latest/debian/buster buster main

###LLVM + Clang + compiler-rt + polly + LLDB + LLD + libFuzzer + libc++ + libc++abi + openmp
deb http://apt.llvm.org/stretch/ llvm-toolchain-buster main
deb-src http://apt.llvm.org/stretch/ llvm-toolchain-stretch main

###MariaDB
deb [arch=i386,amd64] http://mirror.23media.de/mariadb/repo/10.2/debian stretch main
deb-src [arch=i386,amd64] http://mirror.23media.de/mariadb/repo/10.2/debian stretch main

###nginx
deb [arch=amd64,i386] http://nginx.org/packages/debian/ buster nginx
deb-src [arch=amd64,i386] http://nginx.org/packages/debian/ stretch nginx

###NodeJs
deb https://deb.nodesource.com/node_12.x buster main
deb-src https://deb.nodesource.com/node_12.x buster main

###PHP
deb https://packages.sury.org/php/ buster main

###Webmin
deb http://download.webmin.com/download/repository sarge contrib

###yarn
deb https://dl.yarnpkg.com/debian/ stable main

